/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.mycat.calcite.sqlfunction.stringfunction;


import org.apache.calcite.schema.ScalarFunction;
import org.apache.calcite.schema.impl.ScalarFunctionImpl;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.sql.type.*;


public class FindInSetFunction extends MycatStringFunction {
    public static ScalarFunction scalarFunction = ScalarFunctionImpl.create(FindInSetFunction.class,
            "findInSet");
    public static FindInSetFunction INSTANCE = new FindInSetFunction();


    public FindInSetFunction() {
        super("find_in_set", scalarFunction);
    }

    public static Integer findInSet(String pattern, String strlist) {
      if (pattern == null||strlist == null){
          return null;
      }
      if (strlist.isEmpty()){
          return 0;
      }
      int i = 1;
        for (String s : strlist.split(",")) {
            if (pattern.equals(s)){
                return i;
            }
            i++;
        }

        return i;
    }

}

